Customize some keys in the ini. 0 to disable.

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Key       |     What it does
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DELETE - Turn Mod On/Off
NUMPAD 5 - Jump up (also on foot)
NUMPAD 0 - Jump Down
NUMPAD 4 - roll right
NUMPAD 6 - roll left
NUMPAD 7 - rotate right
NUMPAD 9 - rotate left
NUMPAD 1 - freeze car(move to unfreeze)
NUMPAD 3 - Slower freeze
NUMPAD + - Fix and Flip car
NUMPAD / - hyper speed
NUMPAD * - your speed + 3
F12 - EXPLODE
F4 - Super Hit
F5 - do a 180 degree turn, and maintain same speed
F6 - Stick to closest car (can't stick to cars with people already in)
Alt + F6 - Unstick to car
Alt + Backspace - Invisible
BackSpace - Visible
F10 - Teleport to waypoint(set one on the map first)
5 - Normal Speed
6 - Slow Motion
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Insert - Turn Airbrake keys On/Off (also on foot)
Airbrake keys:
num 5 - up
num 0 - down
num 8 - forward
num 2 - back
num 4/6 - rotate
num 3(or 1) - unfreeze